Perform the following to use the Caterpillar® Electronic Technician (Cat® ET) service tool to determine diagnostic codes:
- Connect Cat® ET to the machine.
- Turn the keyswitch to the RUN position.
- Start Cat ET.
Cat ET will initiate communications with the machine ECMs.
After communication has been established, Cat ET will list the ECMs.
- Select the desired ECM.
- View the list of diagnostic codes.
- Troubleshoot the diagnostic codes.
See the test procedure for the specific diagnostic code.
Active Diagnostic Codes
| Illustration 1 | g00859671 |
Typical Cat ET screen for active diagnostic codes | |
The corrective procedures may cause new diagnostic codes to be logged. Before performing any procedure, make a list of all the active diagnostic codes. Clear the diagnostic codes as the problems that caused the diagnostic codes are corrected.
Cat ET displays the following active diagnostic code information:
- Component identifier (CID)
- Failure mode identifier (FMI)
- Text description of the problem
Logged Diagnostic Codes
| Illustration 2 | g00859762 |
Typical Cat ET screen for logged diagnostic codes | |
Cat ET displays the following logged diagnostic code information:
- Component identifier (CID)
- Failure mode identifier (FMI)
- Text description of the problem
- Number of occurrences of the problem
- Time stamp of the first occurrence of the problem
- Time stamp of the most recent occurrence of the problem
Cat ET logs diagnostic codes that are continuous and intermittent.
Note: Diagnostics are logged in non-volatile memory. On powerup, the ECM clears any diagnostic codes that have not been detected or active within the last 150 hours of machine operation.
